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Mapping Cardinalities

 

It describes the number of entities to which another entity can be related

The binary relationship between 2 entity sets, the mapping cardinality should be one of the following.

  1. One to one: An entity in A is related utmost to one entity in B and vice versa.
  2. One to Many: An entity in A can be associated with any number of entities in B. An entity in B can be associated to utmost one entity in A.
  3. Many to one: An entity in A can be associated to utmost one entity in B and entity B can be associated with any number of entities in A.
  4. Many to many: An entity in A is associated with any number of entities in B vice versa.





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